22001212100 has 144 divisors (see below), whose sum is σ = 56323061760. Its totient is φ = 7303824000.

The previous prime is 22001212081. The next prime is 22001212109. The reversal of 22001212100 is 121210022.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22001212109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2763125 + ... + 2771075.

Almost surely, 2^22001212100 is an apocalyptic number.

22001212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22001212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28161530880).

22001212100 is an abundant number, since it is smaller than the sum of its proper divisors (34321849660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22001212100 is a wasteful number, since it uses less digits than its factorization.

22001212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8098 (or 8091 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22001212100 its reverse (121210022), we get a palindrome (22122422122).

The spelling of 22001212100 in words is "twenty-two billion, one million, two hundred twelve thousand, one hundred".